There's some very useful stuff in Wiki, sometimes contributed by knowledgable writers, but it's often only as a starting point to research something further from more authorative sources.

Remember that anyone can contribute to Wiki, whether or not they have any relevent qualifications or experience in the particular subject. Usually, the bad stuff is corrected fairly quickly, but, as anywhere, sometimes a lack of substance can hide behind flowerly and convoluted language. And, as Wiki themselves say on that particular entry, it's open for correction and expansion.